55607022221 has 4 divisors (see below), whose sum is σ = 55681066944. Its totient is φ = 55532977500.

The previous prime is 55607022197. The next prime is 55607022271. The reversal of 55607022221 is 12222070655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55607022221 - 2³⁰ = 54533280397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55607022271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37021235 + ... + 37022736.

It is an arithmetic number, because the mean of its divisors is an integer number (13920266736).

Almost surely, 2^55607022221 is an apocalyptic number.

It is an amenable number.

55607022221 is a deficient number, since it is larger than the sum of its proper divisors (74044723).

55607022221 is an equidigital number, since it uses as much as digits as its factorization.

55607022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74044722.

The product of its (nonzero) digits is 16800, while the sum is 32.

Adding to 55607022221 its reverse (12222070655), we get a palindrome (67829092876).

The spelling of 55607022221 in words is "fifty-five billion, six hundred seven million, twenty-two thousand, two hundred twenty-one".